Sergio DeBrito, 33, of 12 Back River Road, was arrested Monday on charges of criminal threatening and criminal trespass.

Police said DeBrito, an ex-employee of Precision Stone, 20 Star Drive., unexpectedly showed up Friday at the business. He allegedly became argumentative and allegedly threatened to harm an employee as well as the employee’s family.

He intially refused to leave the property when asked, police said, but then did leave without further incident.

Merrimack Police initially misidentified the company for which DeBrito had worked,

During the investigation, police discovered DeBrito is not a legal U.S. resident and the U.S. Department of Immigration, Customs and Enforcement (ICE) was contacted. He was subsequently arrested and processed on the criminal charges. DeBrito was s held on $5,000.00 cash bail and was arraigned Tuesday on the misdemeanor charges in Circuit Court-Nashua District Division.